Brushless phase locked servo drive

Details Brushless phase locked servo drive Brushless phase locked servo drive

H - Electricity

02

P

318/23, 318/89

H02P 23/00 (2006.01) H02P 6/00 (2006.01)

Patent

CA 1057352

IMPROVEMENTS TO BRUSHLESS PHASE LOCKED SERVO DRIVE ABSTRACT OF THE DISCLOSURE The speed and direction of rotation of an electronically commutated brushless D.C. motor is controlled by utilizing a resolver to provide both phase locked servo feedback and motor commutation. The resolver, in response to orthogonal signal voltages on its primary coils, provides a signal whose phase is a function of the motor shaft angle. A phase detector provides a rectangular signal whose on-off ratio in a function of the difference between the phase of the signal from the resolver and the phase of a reference signal. The reference signal phase varies in a predetermined manner as a function of time dependent upon the desired shaft speed and direction of rotation. The phase detector output signal is filtered to produce a D.C. voltage pro- portional to the phase difference and the voltage after passing through a shaping network, is used to amplitude modulate the signal from the resolver. The amplitude signal is then demodulated with respect to the orthogonal signal voltages so as to provide signals to energize the control coils of the motor. -1-

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